Redding Case Forming Dies are made on a custom basis for those who wish to form brass cases from one caliber to another. Most case forming is done to produce ammunition that is not factory available. All wildcat cartridges and many obsolete calibers fall into this category. Case forming dies are designed to change the shape of the overall parent case in small increments to avoid overworking the brass and to prolong case life. After using the proper form dies and or trim die, a full length sizing die is required (not included). Notes:If a form die is listed as #1 or #2, both will be needed to complete the operation.Form dies come with complete instructions.